/*
 * Copyright 2002-present the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.docs.web.websocket.stomp.websocketstompauthenticationtokenbased

import org.springframework.context.annotation.Configuration
import org.springframework.messaging.Message
import org.springframework.messaging.MessageChannel
import org.springframework.messaging.simp.config.ChannelRegistration
import org.springframework.messaging.simp.stomp.StompCommand
import org.springframework.messaging.simp.stomp.StompHeaderAccessor
import org.springframework.messaging.support.ChannelInterceptor
import org.springframework.messaging.support.MessageHeaderAccessor
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer

// tag::snippet[]
@Configuration
@EnableWebSocketMessageBroker
class WebSocketConfiguration : WebSocketMessageBrokerConfigurer {

	override fun configureClientInboundChannel(registration: ChannelRegistration) {
		registration.interceptors(object : ChannelInterceptor {
			override fun preSend(message: Message<*>, channel: MessageChannel): Message<*> {
				val accessor = MessageHeaderAccessor.getAccessor(message,
					StompHeaderAccessor::class.java)
				if (StompCommand.CONNECT == accessor!!.command) {
					// Access authentication header(s) and invoke accessor.setUser(user)
				}
				return message
			}
		})
	}
}
// end::snippet[]
